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以KMnO4为锰源,采用水热技术在180℃条件下于不同种类酸溶液中可控制备了α-,β-,δ-MnO2,系统研究了K+,H+及阴离子对制备产物MnO2晶型和形貌的影响.研究结果表明,K+与H+在反应体系中对于制备产物晶相的生成形成竞争性影响,其量的大小对制备产物晶型具有控制作用,高浓度K+离子有助于生成α-MnO2,而高浓度的H+有利于生成β-MnO2;阴离子的种类和浓度对制备产物MnO2的晶型和形貌无显著影响.在对制备产物进行XRD,SEM和元素分析的基础上,提出了不同晶型和形貌MnO2的可能形成机理.
Using KMnO4 as a manganese source, α-, β- and δ-MnO2 were prepared by hydrothermal technique in different kinds of acid solution at 180 ℃. The effects of K +, H + and anion on the crystal structure of MnO2 and The results show that K + and H + have a competitive effect on the formation of crystal phase in the reaction system. The amount of K + and H + can control the crystal form of the product. The high concentration of K + ions can help to generate α -MnO2, while the high concentration of H + is conducive to the formation of β-MnO2. The type and concentration of anions have no significant effect on the morphology and morphology of the prepared MnO2. On the basis of XRD, SEM and elemental analysis of the prepared product, The possible formation mechanism of MnO2 with different crystal forms and morphology.